Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccf9ee5cc346fdb…

MALICIOUS

PDF

101.9 KB Created: 2021-03-25 13:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7973de3c5bb12ecdf399e8090fb326d7 SHA-1: 54059f39b02652b7a39d714a8fe929ca3388f9db SHA-256: 1ccf9ee5cc346fdb25022025c9a71c289690125232b1b9d1f7235e5c977cce53
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=2020+minus+1992 PDF link annotation
    • http://lifokuvaxodime.iblogger.org/bujenibebuwinekirejim.pdfIn PDF document text
    • http://dorodirebupekel.iblogger.org/zizibepogokugapaxavajemef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3508080a-96e3-40dc-beb1-d4d2e30f04a8/lijoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba79d2c-b466-4621-afa5-a4cbdfd130ea/jekafujadadu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/bedu_pako_baramasa_remix_song.pdfIn PDF document text
    • http://miwunomo.epizy.com/how_to_set_a_casio_telememo_30_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/anbe_per_anbe_audio_song.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_1b56f54a34134502a8e91ce99052c7c5.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_2721947d8ebb417caac5375cea884daa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c86d8fb-fb8c-41f9-9cfe-760da6eff12c/10560222953.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/zojirubovafalonewu.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/libro_auditoria_de_sistemas_de_informacion.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/suvixebidiberoxewufol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5f704c-d13d-478d-9612-6b45a30687ad/bolijizoj.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/pufanisezivuduwofijerifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a97cf3-2774-4d60-bd50-57c9633ed272/what_is_the_standard_enthalpy_change_for_the_reaction_represented_above.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce58e563-8b18-41fe-8625-17b3f9839ceb/32993297952.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_6ac80908de1745928f7e55d35baeb315.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce8c514-9168-4d17-8cff-7c8cff99d575/a_little_life_audiobook_mp3.pdfIn PDF document text
    • http://rixijine.rf.gd/use_of_words_and_phrases_that_appeal_to_the_five_senses.pdfIn PDF document text
    • http://genolesatoj.epizy.com/coreldraw_x4_windows_7_64_bits.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/how_to_use_canon_f_718sga_scientific_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/pumofibefojurun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5a6dd2-8e84-4118-b77c-cea867dcfcbf/vetow.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14373 4452 bytes
SHA-256: f56b2de12dc603cf867f17981b1d2fca786bfde0aaa01ec244b5dde9b2de9cf8
font_01_sfnt_off00015254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15254 11736 bytes
SHA-256: 5855810d364ad2edfdd59ff240a4a050b1d69e4e449a89edbd4a1c2b5de9e90a
font_02_sfnt_off00017a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A47 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34